package com.yqx.guli.product.service.impl;

import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.yqx.common.utils.PageUtils;
import com.yqx.common.utils.Query;

import com.yqx.guli.product.dao.CategoryDao;
import com.yqx.guli.product.entity.CategoryEntity;
import com.yqx.guli.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        //1、查出所有分类
        List<CategoryEntity> entities = baseMapper.selectList(null);

        //2、组装成父子树形结构
        // 1)找出所有一级分类
//        List<CategoryEntity> level1Menus = entities.stream().filter((categoryEntity) -> {
//            return categoryEntity.getParentCid() == 0;
//        }).collect(Collectors.toList());

        List<CategoryEntity> level1Menus = entities.stream().filter(categoryEntity ->
                categoryEntity.getParentCid() == 0 && categoryEntity.getShowStatus() == 1
        ).map((menu) -> {
            menu.setChildren(getChildrens(menu, entities));
            return menu;
        }).sorted((menu1, menu2) -> {
            return menu1.getSort() - menu2.getSort();
        }).collect(Collectors.toList());


        return level1Menus;
    }

    //删除菜单根据 ids
    @Override
    public void removeMenuByIds(List<Long> asList) {
        //TODO 1、检查当前被删除的菜单，是否被别的地方引用

        //逻辑删除数据
        baseMapper.deleteBatchIds(asList);
    }

    @Override
    public CategoryEntity getAllById(Long catId) {
        CategoryEntity categoryEntity = baseMapper.selectById(catId);
        //1、查出所有分类
        List<CategoryEntity> entities = baseMapper.selectList(null);
        categoryEntity.setChildren(getChildrens(categoryEntity, entities));

        return categoryEntity;
    }


    //递归查找所有菜单的子菜单
    private List<CategoryEntity> getChildrens(CategoryEntity root, List<CategoryEntity> all) {
        List<CategoryEntity> children = all.stream().filter((categoryEntity) -> {
            return categoryEntity.getParentCid() == root.getCatId();
        }).map((categoryEntity) -> {
            categoryEntity.setChildren(getChildrens(categoryEntity, all));
            return categoryEntity;
        }).sorted((menu1, menu2) -> {
            return menu1.getSort() - menu2.getSort();
        }).collect(Collectors.toList());
        return children;
    }

}